Dissipation of the striped pulsar wind and non-thermal particle acceleration: 3D PIC simulations

TL;DR

This study uses 3D PIC simulations to explore how magnetic energy dissipates and particles accelerate in pulsar winds through reconnection in the striped wind structure, revealing efficient dissipation and a broad particle spectrum.

Contribution

It provides the first large-scale 3D PIC simulation of pulsar magnetospheres that links global wind dynamics with reconnection-driven dissipation and particle acceleration.

Findings

Reconnection fragments the current sheet into flux ropes and secondary sheets.

Dissipation occurs at a universal radius determined by reconnection rate.

The wind's particle spectrum resembles that of Crab Nebula electrons.

Abstract

The formation of a large-scale current sheet is a generic feature of pulsar magnetospheres. If the magnetic axis is misaligned with the star rotation axis, the current sheet is an oscillatory structure filling an equatorial wedge determined by the inclination angle, known as the striped wind. Relativistic reconnection could lead to significant dissipation of magnetic energy and particle acceleration although the efficiency of this process is debated in this context. In this study, we aim at reconciling global models of pulsar wind dynamics and reconnection in the stripes within the same numerical framework, in order to shed new light on dissipation and particle acceleration in pulsar winds. To this end, we perform large three-dimensional particle-in-cell simulations of a split-monopole magnetosphere, from the stellar surface up to fifty light-cylinder radii away from the pulsar. Plasmoid-dominated reconnection efficiently fragments the current sheet into a dynamical network of interacting flux ropes separated by secondary current sheets which consume the field efficiently at all radii, even past the fast magnetosonic point. Our results suggest there is a universal dissipation radius solely determined by the reconnection rate in the sheet, lying well upstream the termination shock radius in isolated pair producing pulsars. The wind bulk Lorentz factor is much less relativistic than previously thought. In the comoving frame, the wind is composed of hot pairs trapped within flux ropes with a hard broad power-law spectrum, whose maximum energy is limited by the magnetization of the wind at launch. We conclude that the striped wind is most likely fully dissipated when it enters the pulsar wind nebula. The predicted wind particle spectrum after dissipation is reminiscent of the Crab Nebula radio-emitting electrons.